光栅衍射次极大条纹相对强度分布的仿真研究

Simulation study of stripe relative intensity distribution from grating diffraction secondary maximum

根据惠更斯-菲涅耳原理,应用Matlab软件编程,模拟了光栅衍射条纹次极大强度的分布图形,通过改变缝数、光栅常数和缝宽等参数,观察到次极大衍射条纹的相应变化,得出了缝数越多,则次极大的相对强度越小,而光栅常数和缝宽则只能改变次极大的分布。计算机仿真方法扩展了光栅衍射问题的研究途径与方法,具有一定的应用价值,尤其对于教学具有直观作用。

According to the principle of Huygens-Fresnel,the relative stripe intensity distribution is simulated from the secondary maximum grating diffraction by using MATLAB program.The diffraction fringes can be controlled by the number of slots,grating constant,slit width,etc.The result shows that the relative stripe intensity of the secondary maximum becomes weak with increased number of slots;however,the distribution of the secondary maximum will be changed by adjusting grating constant and slit width.This kind of computer simulation method extends the study ways of multi-beam interference problem,and has some potential application value,especially for teaching of visual effect.